Hi, Anthony,
It looks to me that you are mentioning bugzilla-#736.
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=736
Please see the next URL and its followups. The Tristan's patch seems
not yet in xen-ia64-unstable tree.
http://thread.gmane.org/gmane.comp.emulators.xen.ia64/3980/focus=3980
HTH,
Hiroya
Xu, Anthony wrote:
> Hi all,
>
> When I create domain, XEN may complain Error (12, 'Cannot allocate memory')
> even though there are plenty of memory available.
> I think kangkang had reported this bug.
>
> After investigation, I found this is caused by copy_to_guest.
>
> Dom0 calls increase_reservation hypercall to allocate memory for domain.
> At the end of this function, it will copy all mfns to guest address space.
>
> /* Inform the domain of the new page's machine address. */
> if ( !guest_handle_is_null(extent_list) )
> {
> mfn = page_to_mfn(page);
> if ( unlikely(__copy_to_guest_offset(extent_list, i, &mfn, 1)) )
> return i;
> }
>
> But __copy_to_guest_offset may fail in ia64 side, due to XEN may not record
> this
> tlb. Yes, increase_reservation function implements 'retry mechanism', it
> hopes
> dom0 will call it again from the failure point. But dom0 didn't use this
> 'retry
> mechanism', dom0 thought this hypercall fail, and dom0 reported mistakenly
> Error (12, 'Cannot allocate memory')
>
> Thanks,
> Anthony
>
> _______________________________________________
> Xen-ia64-devel mailing list
> Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-ia64-devel
>
>
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